Abstract: An axially compact adjustable stock-bushing assembly for substitution for non-adjustable or solid bushings to hold stock in automatic screw machines and the like; stock is held by three radially pivotable fingers carried in equi-spaced protrusion from one end of an annular nut having at the other end provision for mounting to an automatic screw machine; the fingers are spring-biased outwardly and are positioned by means of inward urging of a cam ring assembly coaxially threaded to one end of the annular nut and carrying fitted over the respective fingers three circumferentially deployed cams which are radially pivotable to either of two stock-size range settings by respective cam-adjustment tabs; screwing of the cam ring assembly further toward the annular nut moves the cams along the finger inclines for tightening the fingers on stock; set screws through the cam ring parallel with the axis bear on a knurled face of the nut, when tightened, to maintain any desired stock-size setting of the assembly.